RIVER CROAL SUB CATCHMENT @ E N V Ir O N M E N T Ag E N C Y
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CHAPTER FOUR - RIVER CROAL SUB CATCHMENT @ E n v ir o n m e n t Ag e n c y NATIONAL LIBRARY & INFORMATION SERVICE HEAD OFFICE Rio House, Waterside Drive, Aztec West, Almondsbury. Bristol BS32 4UD ENVIRONMENT AGENCY 099754 ,No ........ ’^rs Aufhorffv * Intf Centre ( Hec ,09 i Class iv Accession No ACLVJZ,.... IRWELL CATCHMENT MANAGEMENT PLAN CONSULTATION REPORT CHAPTER FOUR - RIVER CROAL SUB-CATCHWIENT Front Cover photograph : River Croal, Bolton Town Centre This report has been produced on recycled paper in line with NRA policy RIVER CROAL CONSULTATION REPORT CONTENTS Section Page No. Index of Maps 9 River Croal Sub-Catchment Details 10 1. INTRODUCTION 1.1 Catchment Description 12 1.2 Hydrology 12 1.3 Hydrometric Network 13 1.4 Hydrogeology 14 1.5 Flood Defence 15 1.6 Water Quality 16 September 1994 2 Irwell CMP Chapter Four - Croal Sub-Catchment CONTENTS Page No. 2. CATCHMENT USES AND ACTIVITIES Flood Defence 17 2.1.1 General 17 2,1.2 Local Perspective 17 2.1.3 Flood Warning 18 2.1.4 Objectives 18 2.1.5 Environmental Requirements 18 Development 19 2.2.1 General 19 2.2.2 Local Perspective 19 2.2.3 Local Planning Policy 19 2.2.4 Future Development in the Catchment 20 Potable (Drinking) Water Supply 21 2.3.1 General 21 2.3.2 Local Perspective 21 2.3.3 Supply Objectives and Standards 22 2.3.4 Customer Supply Requirements 23 Water Quantity Water Quality Groundwater Quality 2.3.5 Environmental Requirements 23 Industrial and Agricultural Abstractions 24 2.4.1 General 24 2.4.2 Local Perspective 24 Industrial General Agriculture Spray Irrigation 2.4.3 Supply Objectives and Standards 24 2.4.4 Customer Requirements 25 Water Quantity Water Quality 2.4.5 Environmental Requirements 25 Resource Usage 26 2.5.1 General 26 2.5.2 Local Perspective 26 Surface Water Groundwater September 1994 3 Invdl CMP Chapter Four - Croai Sub-Catchment CONTENTS Page No. 2.6 Effluent Disposal 27 2.6.1 General 27 Continuous Effluents Intermittent Effluents 2.6.2 Local Perspective 27 Continuous Effluents Intermittent Effluents 2.6.3 Environmental Objectives 28 2.6.4 Environmental Requirements 28 Water Quality Water Quantity 2.7 Landfill Sites 29 2.7.1 General 29 2.7.2 Local Perspective 29 2.7.3 Objectives 29 2.7.4 Environmental Requirements 29 Water Quality Water Quantity Physical Features 2.8 Mineral Extraction 31 2.8.1 General 31 2.8.2 Local Perspective 31 2.8.3 Objectives and Standards 31 2.8.4 Environmental Requirements 31 Water Quality Water Quantity Physical Features 2.9 Groundwater Protection 33 2.9.1 General 33 2.9.2 Local Perspective 33 2.10 Fisheries 35 2.10.1 General 35 2.10.2 Local Perspective 35 2.10.3 Environmental Objectives 35 2.10.4 Environmental Requirements 35 Water Quality Water Quantity Physical Features September 1994 4 Irwel! CMP Chapter Four * Croal Sub-Catchment CONTENTS P age No. 2.11 Conservation 37 2.11.1 General 37 2.11.2 Local Perspective 37 2.11.3 Aquatic Invertebrates 38 2.11.4 Environmental Objectives 38 2.11.5 Environmental Requirements 39 Water Quality Water Quantity Physical Features 2.12 Landscape and Heritage 40 2.12.1 General 40 2.12.2 Local Perspective 40 2.12.3 Environmental Objectives 41 2.12.4 Environmental Requirements 41 Water Quality Water Quantity Physical Features 2.13 Recreation and Amenity 43 2.13.1 General 43 2.13.2 Local Perspective 43 2.13.3 Environmental Objectives 43 2.13.4 Environmental Requirements 43 Water Quality Water Quantity Physical Features 2.14 Angling 44 2.14.1 General 44 2.14.2 Local Perspective 44 2.14.3 Objectives 44 2.14.4 Environmental Requirements 44 Water Quality Water Quantity Physical Features September 1994 Invell CMP Chapter Four - Croal Sub-Catchment CONTENTS Page No. 3. CATCHMENT OBJECTIVES 3.1 Flood Defence Objectives 45 3.1.1 General 45 3.1.2 Objectives 45 3.2 Water Quantity Objectives 46 3.2.1 General 46 3.2.2 Objectives 46 Water Abstraction Surface Waters Local Hydrometric Objectives Groundwaters 3.3 Water Quality Objectives 48 3.3.1 Water Quality Classification 48 a) Present Water Quality Classification Objectives b) Future Water Quality Classification Objectives 3.3.2 EC Directives 49 a) Directive on Dangerous Substances in Water b) Directive on Urban Wastewater Treatment c) Directive on Water Quality for Freshwater Fish d) Directive on Abstraction of Surface Water for Drinking 3.3.3 Groundwater Protection Objectives 50 3.4 Physical Features Objectives 52 3.4.1 General 52 3.4.2 Objectives 52 Development Control Potable Water Supply, Agricultural and Industrial Abstraction Mineral Extraction and Landfill Sites Fisheries Conservation Landscape and Heritage Recreation and Amenity Angling September 1994 6 Irwell CMP Chapter Four - Croal Sub*Catchment CONTENTS Page No. 4. CURRENT STATE OF THE CATCHMENT 4.1 State of Catchment: Flood Defence 54 4.1.1 General 54 4.1.2 Issues Identified 54 a) Catchment Wide Issues b) Site Specific Issues 4.2 State of the Catchment: Water Quantity 56 4.2.1 General 56 4.2.2 Local Hydrometric Network 56 River Level Recording Rainfall Monitoring 4.2.3 Issues Identified 57 a) Catchment Wide Issues b) Site Specific Issues 4.3 State of the Catchment: Water Quality 58 4.3.1 Water Quality Classification 58 a) Present Water Quality Classification Objectives b) Future Water Quality Classification Objectives 4.3.2 EC Directives 58 a) Directive on Dangerous Substances in Water b) Directive on Urban Wastewater Treatment c) Directive on Water Quality for Freshwater Fish d) Directive on Abstraction of Surface Water for Drinking 4.3.3 Issues Identified 59 a) Catchment Wide Issues b) Site Specific Issues 4.4 State of the Catchment: Physical Features 62 4.4.1 General 62 4.4.2 Issues Identified 62 a) Catchment Wide Issues b) Site Specific Issues September 1994 Irwell CMP Chapter Four • Croal Sub-Catchment CONTENTS Page No. 5. ISSUES AND OPTIONS 5.1 General 64 5.2 Sub-Catchment Wide Issues 65 5.3 Site Specific Issues 66 September 1994 8 Irwell CMP Chapter Four - Croa! Sub-Catchment INDEX OF MAPS Title Facing Page No. 1 Croal Location 10 2 Croal Catchment with Infrastructure 12 3 Hydrometric Network 13 4 Summary Geological Map 14 5 River Network 15 6 Licensed Abstractions: Public Water Supply 21 7 Licensed Abstractions : Industrial & Agricultural 24 8 Effluent Disposal 27 9 Landfill Sites 29 10 Fisheries 1 : River Habitat Potential 35 11 Fisheries 2 : Actual Species Present 35 12 Fisheries 3 : Shortfalls in Habitat Potential 35 13 Designated Sites of Conservation Importance 37 14 Landscape and Heritage 40 15 Recreation and Amenity 43 16 Angling 44 17 Flood Defence: River Corridor Land Use Plan 45 18 Flood Defence : Objectives 45 19 Water Quality : Present Classification Objectives 48 20 EC Directive Compliance 49 21 Flood Defence : Flood Risk Areas 54 22 Flood Defence: State of the Catchment 54 23 Flood Defence: Existing Levels of Protection 54 24 Water Quality : State of the Catchment 58 25 Site Specific Issues Location Map 64 9 Irwell CMP Chapter Four - Croal Sub-Catchment 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 30 30 28 28 CROAL LOCATION 26 26 KEY 24 Irwell catchment boundary 24 Croal Sub-Catchment boundary 22 22 Sub-Catchment boundary 20 Built up area 20 Watercourse 18 18 Culverted section 16 Canal 16 Irwell Catchment Management Plan 14 14 Croal Sub-Catchment 12 June 1994 Map 1 12 10 NRA 10 \jr National Rivers Authority 08 North West Region 08 06 06 04 04 02 02 SD N SE 00 A 00 SJ SK 98 98 96 96 10 km 94 J_____I_____I_____L 94 92 92 SJ SK 46 48 50 52 54 56 58 60 62 64 66 68 72 74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 RIVER CROAL SUB-CATCHMENT DETAILS (MAP 1) Area 148 km2 Population 200,000 MAIN TOWNS AND POPULATIONS Bolton 140,000 F am worth 24,000 ADMINISTRATIVE DETAILS District Councils:- Bolton Metropolitan Borough Council Blackburn Borough Council Bury Metropolitan Borough Council (small area) NRA:- North West Region - South Area Water Companies:- North West Water Ltd. Principal Sewage Treatment Works:- Belmont TOPOGRAPHY Ground Levels Min. Level 50 mAOD Max. Level 450 mAOD GEOLOGY Solid Geology:- South Carboniferous Coal Measures North Alternating Carboniferous Coal Measures & Millstone Grit Series Superficial Geology:- Variable - Predominantly Glacial Till (Boulder Clay) Localised Sand and Peat deposits September 1994 10 Irwell CMP Chapter Four - Croal Sub-Catchment WATER RESOURCES Availability:- Groundwater - Generally site specific Surface Water - Good availability FLOOD PROTECTION Length ofDesignated Main River:- 63.19 km. (maintained by NRA) Riparian owned debris screens cleaned 17 by the NRA on a best endeavours basis WATER QUALITY Length of River in National Water Council Class 1993 Assessment Class 1A (Very Good)0.0 km. Class 3 (Poor) 1.3 km. Class IB (Good) 10.3 km. Class 4 (Bad) 0.6 km. Class 2 (Fair) 40.1 km. FISHERIES Length of salmonid fishery:- 23 km. cyprinid fishery:- 10 km. CONSERVATION Number of Sites of Special Scientific Interest (SSSI) in the catchment 4 (+ 1 proposed) Number of SSSI's which are associated with the River Corridor and/or 3 (+ 1 proposed) wetland habitats Number of Site of Biological Importance (SBI) in the catchment 50 (NB. Blackburn site not available) Number of SBI's which are associated with River Corridor and/or wetland habitats 25 September 1994 11 Irwell CMP Chapter Four - Croal Sub-Catchment 61 62 63 64 65 66 67 68 69 70 7 1 72 73 74 75 76 77 61 62 63 64 65 -66 6*7.